Concentrating again, Jeff willed his external balls to start growing, and lo-and-behold, they did. From Ping-Pong balls, to large eggs, to kiwis, to lemons, they grew and grew. Finally, he stopped the growth after a minute, doubling over to inspect his now apple-sized testes. Hefting them in his palms, he felt their weight and density before letting them drop down again, wincing slightly from the sudden jerk. Looking up at Clara, his eyes implored her to explain.
"Oh, alright. I stopped changing the entirety of males, by the way, so now you're the only one that can do that. Not only that, you have complete control over your body, and those around you, in a male sense. For example, if some other guy was annoying you, you could, say, shrink his dick or simply make it go away altogether. Muscled jock making a pain of himself? Make him a skinny nerd. Someone want to have multiple cocks for some reason? Yup, you can do it. A woman wants to change to a futa or herm, go for it. The possibilities are nearly endless."
Speechless, all Jeff could do was stare at his girlfriend for a moment, before he lunged at her and engulfed her in a tight hug.
"Thank you so much!" He exclaimed, pulling back slightly to look at her face. "I've always dreamed of being able to change myself, and well, now I can! Thank you!"
Giving her a big kiss, he lunged over to the computer and started making a few adjustments.